A proposal for optical WDM using embedded photonic crystal ring resonator with distributed coupling

Abstract

In this paper, an ultra-narrow band channel drop filter (CDF) based on embedded photonic crystal ring resonator with distributed coupling for optical wavelength division multiplexing is proposed and designed in which silicon rods arranged as square lattice. For this purpose, the influences of variation of the central ring radius, on the operating wavelength have been investigated. Calculation results show that the efficiency of 88% with quality factor of 5740, 98% with quality factor of 4889 and 98% with quality factor of 4798 at operating wavelength of 1550nm can be achieved. Consequently the channel band width and channel spacing are reduced to 270pm and 600pm respectively, which will be suitable for dense wavelength division multiplexing (DWDM) optical network systems with 600pm channel spacing. Simulations have been performed using 2-D finite difference time-domain (2D FDTD) calculations.